TryGetNonEnumeratedCount< TSource >()

static bool System.Linq.Enumerable.TryGetNonEnumeratedCount< TSource > ( this IEnumerable< TSource > source, out int count )

inlinestatic

Definition at line 4483 of file Enumerable.cs.

    {
        if (source == null)
        {
            ThrowHelper.ThrowArgumentNullException(ExceptionArgument.source);
        }
        if (source is ICollection<TSource> collection)
        {
            count = collection.Count;
            return true;
        }
        if (source is IIListProvider<TSource> iIListProvider)
        {
            int count2 = iIListProvider.GetCount(onlyIfCheap: true);
            if (count2 >= 0)
            {
                count = count2;
                return true;
            }
        }
        if (source is ICollection collection2)
        {
            count = collection2.Count;
            return true;
        }
        count = 0;
        return false;
    }

References System.collection, System.Linq.count, System.Collections.Generic.Dictionary< TKey, TValue >.Count, System.Linq.source, and System.Linq.ThrowHelper.ThrowArgumentNullException().